glutathione reduced structure of Reduced glutathione is freely soluble in water What is Glutathione? – GoldBio
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This copper(I) structure with three ligands attached yields an electron count of 16

Mechanism-level data show GHK-Cu enlarges hair follicles and prolongs the anagen phase in rodent models

Moreover, Niu et al

After that window, the preservative action may not be sufficient to prevent contamination, and you should discard any remaining solution
